All,
I’ve been restoring a SB220 and finally got to the testing stage this weekend.
When I turned it on, the HV went up to ~1kV and then started to drop.
Successive cycles of the power switch did nothing. Oddly, the meter lights and
fan never started running. I looked at the bottom of the amp tonight and the 3A
fuses I added to the W7RY step start board blew. What areas should I look at
now to determine what is going wrong? I have both tubes in, and I believe I
previously checked them for filament shorts. I’m worried the HV supply has an
issue.
Any advice would be very much appreciated!
Thanks!
-Warren
KD5YPH
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